I am trying to get a deeper understanding of sine wave inverters (like this one) and thereby came across different topologies like a Push pull inverter with a center taped transformer or a full bridge configuration as seen in a class D amplifier.

I think that the center taped transformer setup requires less transistors but a bigger transformer whereas the full bridge option gets along with a smaller transformer.

Nonetheless I am not able to find more details or an overview of maybe other different existing topologies e.g. When to use which topology for a special power rating.

Am I looking for the wrong buzzwords or can somebody help me out with a link to books/application notes/etc describing inverter topologies and their characteristics?

  • 1
    \$\begingroup\$ Just google "inverter topology" and you get lot of results: papers, white papers, etc. You might be interested in 3-ph inverters, single-phase, multi-level, neutral point clamped, etc. This for mainly "industrial" applications, including e.g. PV generation, power drives, etc. (cannot attach the screenshot to a comment) \$\endgroup\$
    – andrea
    May 14 at 8:55
  • 2
    \$\begingroup\$ The small (<5kW) sine wave inverters I've come across use a buck or other converter to boost the DC up to 320V (assuming 240VAC output) then use a H bridge and pwm to synthesize the sine wave followed by a RC filter to clean it up. A class D amplifier in other words. \$\endgroup\$
    – Kartman
    May 14 at 10:22
  • \$\begingroup\$ @Kartman That is a really cool topology, although without isolation but probably cheaper! \$\endgroup\$
    – Thauer
    May 14 at 10:57
  • \$\begingroup\$ @Kartman a buck converter doesn't boost voltages. \$\endgroup\$ May 14 at 11:39
  • \$\begingroup\$ Yes, I did intend to write ‘boost’. Been having buck converter issues at the office, so it stuck in my brain! \$\endgroup\$
    – Kartman
    May 14 at 13:08

The transformer size is slightly larger for centre tapped (because slightly more copper is needed in the transformer primary)

In a teardown video they show the 120V version of this inverter with two large MOSFETs on a heatsink, so probably a centre tapped transformer.

In a compact inverter like this one the transformer probably runs at a high frequency to produce a high DC voltage that is then chopped to make AC at 50Hz.


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